Vaccinium myrtillus, also called bilberry and huckleberry, is both an edible fruit and an herbal remedy used for many health conditions. There is insufficient evidence to evaluate bilberry for most medicinal uses, according to MedlinePlus, a service of the U.S. National Library of Medicine. Allergic reactions to bilberry are possible, although uncommon. Consult your primary health care professional before taking bilberry in medicinal doses.
Safety
Bilberry fruit powders and extracts seem to be safe for most people, advises MedlinePlus. Bilberry leaf may be unsafe if taken in high doses or for a long time frame. Bilberry leaf tea can be consumed on a short-term basis using up to 2 tsp. of chopped dried leaf steeped in 150 mL boiling water.
Allergy Risk
Bilberry belongs to the Ericaceae plant family. If you are allergic to any plants in this family, it's more likely you are allergic to bilberry. Blueberry, which is similar to bilberry, is in the Ericaceae family. Some other plants in this family include azaleas, heathers and rhododendrons. In addition, you might have a reaction to bilberry if you are allergic to plant pigments known as anthocyanosides, as bilberry has a high concentration of these substances. Consult your doctor or pharmacist before consuming bilberry if you have any allergies, particularly to plants.
Allergy Symptoms
Allergic reactions to bilberry are rare, according to Drugs.com. Symptoms of an allergic reaction to bilberry may include a rash, hives, itching, trouble breathing, chest tightness, throat closing and facial or mouth swelling. Seek immediate medical attention if you develop any of these symptoms while taking bilberry. An allergic reaction may lead to anaphylaxis, which can be life-threatening.
Other Side Effects
More likely side effects when taking bilberry as an herbal remedy are an upset stomach, dry mouth or dry eyes, according to Drugs.com. Bilberry may slow blood clotting ability, which could increase the effects of blood thinning medication and increase the risk of excessive bleeding. In addition, bilberry may lower blood sugar, which might boost the effects of medicines that regulate blood sugar and increase the risk of hypoglycemia.
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